AI app builders compared: Lovable, Bolt, Base44, and Replit by need

How these picks were made

All four tools make the same offer: you describe the app in plain language, an AI writes the code, and the product supplies the database and the publishing. That is what people call vibe coding, and it is why these tools also get filed under no-code app builders.

automascope has not run a real trial of these tools. The data comes from each vendor’s pricing page, documentation, and terms, read on the date shown under the table. The picks at the top of the page are not a ranking: each line answers one specific need and names the data point behind it. A tool can appear twice, and another can suit a need that is not listed.

Four tools, four ways of counting

An entry price says very little until you know what it buys. Take a month of building with 40 requests to the AI: 20 visual tweaks, 15 routine changes, 5 heavier additions.

Tool	What is counted	The 40-request scenario
Lovable	Credits; the cost of a message depends on the task	20 × 0.50 + 15 × 0.90 + 5 × 1.20 = 29.5 credits, using the vendor’s examples
Bolt	Tokens; the cost of a message grows with project size	Cannot be calculated: no cost per message is published
Base44	Message credits for building, integration credits for the live app	20 × 0.5 + 15 × 1 + 5 × 2 = 35 message credits, using the vendor’s estimates
Replit	A dollar amount that pays for the agent, hosting, and the database; the agent is billed by effort	Cannot be calculated: no price per checkpoint is published

What the math shows:

• Lovable and Base44 can be estimated ahead. The scenario barely fits in Lovable’s free plan (30 build credits per month, 5 per day), and not in Base44’s (25 message credits). On paid plans, Lovable Pro ($25 per month) starts at 100 credits and Base44 Starter ($20 per month) gives 100 message credits: about three times the scenario in both cases.
• Bolt and Replit you find out afterward. Bolt Pro ($25 per month) starts at 10,000,000 tokens; Replit Core ($20 per month) includes 20 dollars of credits. Neither publishes what you would need to convert 40 requests into its unit.
• The balance does not only pay for building. On Lovable, the same balance funds the backend and the AI of the published app. On Replit, the allowance also pays for publishing. On Base44, running the app has its own counter. On Bolt, hosting has its own request quotas.

The guide to billing units explains why these units cannot be compared at a glance.

“I want to start without paying”

• Bolt: 1,000,000 tokens per month (at most 300,000 per day), no credit card, public and private projects, unlimited databases, hosting included up to 333,000 requests and 10 GB per month.
• Lovable: 5 build credits per day, capped at 30 per month, no credit card. No code editing or download. On publishing, the vendor’s pages contradict each other: invite-only according to the pricing page, public or invite-only according to the documentation.
• Base44: 25 message credits per month (at most 5 per day), 100 integration credits, 5 apps, authentication and database included.
• Replit: a Starter plan described in the documentation but absent from the pricing page; daily Agent credits (amounts not recorded), a single published app, taken offline after 30 days.

Bolt is picked on one criterion: it is the only one of the four free plans for which private projects, an unlimited number of databases, and hosting with stated quotas are all recorded. It is not the most predictable: token consumption grows with the project. In all four cases, a custom domain and badge removal require a paid plan, except on Replit, where the plan condition for the domain is not recorded.

“I want to keep my code”

• Lovable: Two-way GitHub sync on all plans; .zip download on paid plans. source
• Bolt: Project download as a zip file; GitHub sync on the main branch only. source
• Base44: Two-way GitHub sync and zip export from the Builder plan up. source
• Replit: Built-in Git, GitHub sync from the Git pane, branches managed in the editor, import of a GitHub repository. source

Lovable is picked because its documentation explicitly opens GitHub to all plans. On Base44, you need Builder, the third plan. For Bolt and Replit, no plan condition is recorded. Keeping your code is not always enough to leave: on Lovable, moving off the built-in backend is only possible toward Supabase.

“I want a mobile app”

• Bolt: iPhone and Android with Expo, which must be requested in the very first prompt; publishing through Expo’s EAS commands, with paid Apple and Google developer accounts.
• Replit: an app built with Expo, submitted to Apple through its beta distribution service; Google Play is not yet supported.
• Base44: files for the App Store and Google Play from Builder up, where the app runs in a web view (your site displayed inside an app shell).
• Lovable: web apps only, with no built-in store submission.

Database, user accounts, hosting

All four supply a database with no extra service to add. The differences are elsewhere:

• User accounts. Base44 includes sign-in with email, Google, Microsoft, Facebook, and Apple. Bolt handles email and Google. On Replit, Replit Auth sends your users through a Replit account and is aimed at prototypes; a product under your own brand goes through Clerk.
• Hosting. On Lovable, a live site does not consume credits by itself. On Base44, hosting is built in, with no deployment step. On Bolt, it is included with request quotas. On Replit, publishing is paid from credits, except static hosting.
• Out of quota. Lovable, Bolt, and Base44 stop building until the reset or a top-up; Base44 describes no purchase of additional credits. Replit keeps going and bills for usage.

Tool by tool

Lovable suits a web app whose cost you want to estimate and whose code you want to keep. Limits recorded: no mobile, and a single balance that the published app also draws on. See the Lovable profile and Lovable pricing.

Bolt suits anyone aiming for the app stores or wanting to start for free with private projects. Limits recorded: no published cost per message, and a GitHub sync limited to the main branch. See the Bolt profile and Bolt pricing.

Base44 suits an internal tool or an app where users sign in. Limits recorded: code export from Builder up, data in the United States by default and, outside the Enterprise plan, data that may be used to train AI models. See the Base44 profile and Base44 pricing.

Replit suits a project that will turn technical: PostgreSQL, Git with branches, several publishing types. Limits recorded: a cost per request known only afterward, hosting deducted from the allowance, and a bill that can exceed the plan without a budget cap. See the Replit profile and Replit pricing.

How to choose

1. Web or mobile? Mobile on both stores: Bolt. Web only: all four stay in the running.
2. Fixed budget or headroom? If the bill must never exceed the plan, rule out Replit or set its budget cap. If being blocked late in the month is worse than an extra charge, it is the other way around.
3. Does the code need to come out from day one? Lovable opens it on all plans; on Base44, budget for the Builder plan.
4. Where does the data need to live? Lovable lets you pick the region at activation; Base44 defaults to the United States and keeps other regions for Business or Enterprise plans; this point is not recorded for Bolt and Replit.

Still torn between two? The head-to-head pages go further: Lovable vs Bolt, Lovable vs Base44, Lovable vs Replit, Base44 vs Replit. The same four tools are covered, by reason for switching, in the Lovable alternatives.

What this comparison does not tell you

A table compares what is published. It does not say whether the generated code is good, or how many messages it takes to get to the result: that depends on the project, and no vendor puts a number on it. Several points remain not recorded: the data hosting region for Bolt and Replit, and whether a French-language interface exists for any of the four.