The best app builder for agencies is the one that lets you hand the whole thing to the client.
If you build apps for other people, the best app builder for agencies is decided at handover rather than in the feature list. Two questions settle most of it. Can the client walk away with the source code, and can the app ship from the client's own Apple account? The second one is not a preference, it is a rule. Apple's guideline 4.2.6 rejects apps created from a commercialized template or app generation service unless the provider of the app's content submits them directly. We read that clause again today. Almost everything else in agency app development follows from those two answers.
So our position, with the bias stated up front. For client work that lists on a store, choose a tool that produces a real codebase and uploads into the client's account. Treat white labeling as a nice to have. That choice survives the client firing you, the client hiring an in house developer, and the client's lawyer reading your contract. It does depend on the work. One internal operations tool that never reaches a store has very different needs from twelve consumer apps a year.
Match a builder to your next clientThe short version
Agencies are billed by the seat and judged on the handover, and the pricing pages only cover the billing.
Read the three pricing pages we quote below and a pattern shows up. FlutterFlow sells seats and does not use the word agency anywhere on its pricing page. Adalo names a tier for freelancers and agencies and caps it at five published apps. GlideOS counts published apps as well, five of them on its $50 Plus plan, and never mentions the App Store, Google Play or a code export. None of them describes what happens to the client's app when the engagement ends, which is the part your contract has to answer. There is no product category called an agency app builder. There are builders whose output leaves with the client, and builders whose output does not.
The thing worth knowing before you shortlist anything is Apple's guideline 4.2.6, because it decides whose account the app ships from. It is also the one point the ranking pages for this query do not make. Get the account right and the build tool becomes a preference. Get it wrong and a finished app sits in review limbo while a client watches.
Four things decide an agency build, and one of them is on the pricing page
Who ends up with the repository. Whose App Store Connect account the app ships from. Whether the bill scales with your seats or with the number of live client apps. And who the client calls in eighteen months when iOS changes and something breaks. That is the whole list. An app builder for client work gets judged on all four, and only the third of them appears on a pricing page, which is why pricing pages are a poor way to choose.
Code ownership is the item clients now ask about by name, and there are two shapes on the market. A builder that produces a project in a real framework, which can sit in the client's own repository and be read by any developer they hire later. Or a builder where the app exists only inside the vendor's editor and stops existing when the subscription stops. The second shape is not automatically wrong. It is wrong when you sold a deliverable and handed over a login. The contract language and the questions to ask are in code ownership no code.
The billing question is the one agencies underprice. A platform that caps published apps is charging you per client, whatever the tier is called, and the cap arrives on the day you win work rather than the day you sign up. A platform that charges per seat is charging you per employee, so a five person studio pays five times before a single client app is live. Count your real book of work against both numbers, not against the headline tier.
Guideline 4.2.6 decides who presses submit
Here is the clause in full, from the current App Review Guidelines, opened today. Guideline 4.2.6: apps created from a commercialized template or app generation service will be rejected unless they are submitted directly by the provider of the app's content. The guideline then adds that those services should not submit apps on behalf of their clients, and should offer tools that let their clients create customized, innovative apps that provide unique customer experiences.
For an agency, the provider of the app's content is almost always the client. Their brand, their menu, their bookings, their members. So the app ships from the client's own Apple Developer Program account, under the client's legal name, with the client as the seller on the listing. You can be invited into that account and do every piece of the work, the build and the upload included. The submission has to be theirs. The practical move is to start the client's enrollment in week one of the project instead of the week you want to launch, and the steps for that sit in whose developer account.
The guideline offers one other route, and it is worth reading before you design the business rather than after. A template provider may ship a single binary that hosts all client content in an aggregated or picker model. Apple's own examples are a restaurant finder with a separate customized entry for each client restaurant, and an event app with a separate entry for each client event. That is a product you operate, not a project you hand over. It is a different company from the one that bills per build, with support and uptime attached.
What the guideline does not do is define app generation service, and Apple does not publish how reviewers draw that line. We looked for an Apple page that addresses AI written code under 4.2.6 and did not find one, so we are not going to tell you where the boundary falls. What the text and its examples are plainly about is the submitting account and many near identical binaries from one provider. One distinct app per client, submitted by that client, is on the right side of it however the code was produced.
What the builders' own pages say about client work
FlutterFlow's own pricing page, read on 1 October 2026, is the clearest of the three about what an agency actually pays for. Code Download and APK Download start on the Basic plan at $39 a month, which also lists unlimited projects, one editor and one click App Store deployment. After that you pay for people. Growth is $80 for the first seat per month and $55 for the second. Business is $150 for the first seat and $85 for seats two to five, with up to five editors, CLI access, centralized billing and project level access control. The word agency does not appear on it anywhere.
Adalo is the opposite. Its pricing page names the tier for client work directly: Team, labelled for freelancers and agencies, at $160 a month billed annually, with five published apps, ten app editors, version history and white labeling. Monthly billing costs 20 percent more. Published apps is the number to watch, because the page's own footnote says each published app represents a unique database, and the Professional tier, at $52 on the same annual billing, allows two of them. Nothing on that page offers a code export or a source download, so plan an Adalo handover as an account transfer rather than a repository.
Glide's newer product is GlideOS, and its pricing page says plainly that this is a standalone product, separate from what it calls the original Glide platform, needing its own subscription. Basic is $25 a month, Plus is $50 with five published apps, and Pro is $125 with unlimited published apps and workflows, 100 projects and, in its words, starting at 5 team members. The page never mentions the App Store, Google Play, white labeling or a code export. Read that as a description of its shape rather than a complaint. GlideOS is for internal business tools, and for that work store mechanics would be dead weight.
One gap in our own research, stated instead of filled in. Bubble's pricing page would not render for us without JavaScript today, so we are not quoting its plan numbers or its agency account here, and you should open it yourself before you budget around it. The honest frame for this category is narrower than the roundups suggest. The shortlist is short, and for most agency briefs the real comparison is against a contract developer. We took that one apart in hire developer vs no code.
FlutterFlow's own pricing page, plan prices and code download
Which one fits the kind of client work you do
Three rules cover most agency briefs. If the deliverable lists on the App Store, start from the client's Apple Developer Program account and a builder that gives you real source. If the deliverable is an internal tool for one client who will never touch code, a hosted builder is less work and cheaper to keep alive for years. If you expect more than five live client apps, price the published app cap before you price your retainer, because that cap is what you will hit first.
Reasons to pick something other than us, plainly. If your team already writes Flutter, FlutterFlow's code download plus its GitHub integration is a shorter route than teaching everyone a new agent. If the client wants a branded editor to log into, Adalo's Team plan is the only one of these three whose page lists white labeling, and its Starter plan lists no Adalo branding in the app itself. If the brief is an operations tool built on a spreadsheet, GlideOS was made for exactly that and an App Store pipeline is wasted on it.
Newly fits the first rule. You describe the app in plain English and it writes a real React Native and TypeScript project you own. It runs on cloud iOS and Android simulators while it builds, then uploads to App Store Connect and TestFlight and publishes to Google Play internal testing. It does not submit for review, which is exactly the behaviour guideline 4.2.6 asks for: the client presses that button from their own account. Two things that would rule it out for an agency. There is no free plan, so a pitch you have not won yet still costs $25 a month. And Supabase and Firebase are unsupported, so a client standardized on either is a poor fit.
Three questions, then a shortlist
What is the deliverable?
Who owns it afterwards?
How many client apps at once?
You need source code and the client's own store account
Guideline 4.2.6 wants the content provider to submit. Shortlist builders that publish a code export: FlutterFlow lists Code Download from its 39 dollar Basic plan.
At more than five live apps, price the published app cap first: Adalo's agency tier lists five, GlideOS Pro lists unlimited, FlutterFlow charges for editors instead.
What each builder's own page says an agency gets
| Builder and plan | Price on its own page, 1 October 2026 | Editors included | Client apps live at once | What the client can take away |
|---|---|---|---|---|
| Newly | One flat monthly price, no free plan | Not published | Not published | A React Native and TypeScript project, as a ZIP, through GitHub sync or the CLI |
| FlutterFlow Basic | $39 a month | 1 | Unlimited projects | Code download and APK download |
| FlutterFlow Business | $150 first seat, $85 seats two to five | Up to 5 | Unlimited projects | Code download, GitHub integration, CLI access |
| Adalo Team, its freelancers and agencies tier | $160 a month billed annually | 10 app editors | 5 published apps | No export listed on its pricing page |
| GlideOS Pro | $125 a month | Starting at 5 team members | Unlimited published apps | No export listed, and no store publishing mentioned |
Building a client app you can hand over cleanly
Handover is a design constraint, not a final step. Decide in week one whose developer account the app ships from, where the repository lives, and what the client keeps if they stop paying you. Then build in a way that can satisfy all three without a rewrite. Everything that goes wrong in agency app work goes wrong because one of those three was left until the launch.
Newly is an AI app builder. You describe the app in plain English and it writes a real React Native and TypeScript project you own, runs it on cloud iOS and Android simulators while it builds, then ships it to TestFlight and to Google Play internal testing. It is $25 a month and there is no free plan. New apps start local first, keeping their data on the phone with no accounts and no server, which is the right default for a small client app and keeps the privacy section of the submission short. The agent adds Newly Backend only when the app needs accounts, shared data, syncing or payments, and that brings sign in, an API service, a Postgres database per environment and file storage. Subscriptions come from a Connect RevenueCat card, and push notifications from a OneSignal card.
Ownership is the practical part for client work. The code comes out as a ZIP from project Settings, through the two way GitHub sync under Deploy, or with the CLI. So the client's repository can be the source of truth from the first week rather than the last. Uploads go to App Store Connect and TestFlight, owner or admin only, and the submit button stays with whoever owns the account. That is the arrangement guideline 4.2.6 is written to produce, and it is also the arrangement that makes a clean exit possible.
Questions agencies ask before picking an app builder
The one whose output you can hand over. For client apps that list on the App Store, that means a builder that gives you a real codebase and uploads into the client's own account. Apple's guideline 4.2.6 requires the provider of the app's content to submit. For an internal tool nobody will ever take away, a hosted builder such as GlideOS is less work. Match the tool to the deliverable rather than to the demo.
Build the client's app so the client can keep it
Pick the account before you pick the palette. Decide whose developer program the app ships from, where the repository will live, and what happens to both when the engagement ends. Then build it, and let the client press submit.
Start building