The Best App Localization Tools for Indie Developers in 2026

This roundup is published by Localize Your App, one of the tools listed in it. That is worth knowing before you read a word of it, so it is the first thing here. Every price below was read on the vendor's own pricing page on 28 August 2026 and nothing has been estimated. For most indie apps the real shortlist is Localize Your App, SimpleLocalize, Localazy, Crowdin and String Catalog, with OneSky as the per-word option when you want a human involved. Lokalise, Phrase, Smartling, Blend and Localize are here so the picture is complete — they are built for teams, enterprises and agencies, and each section says plainly when one of them is the better choice.

How to choose

Three questions decide this far more than any feature matrix.

1. How often do your strings change? If you translate once for a launch and then rarely touch copy, a one-time job matches the work. If strings change every sprint, you want something that stores keys, tracks what is new, and does not make you re-upload the whole file by hand.
2. Does anyone else need to be in the loop? A solo developer who reviews machine output themselves does not need seats, roles or approval workflows. The moment a translator or another engineer has to comment on a string, you need a platform with users and permissions.
3. Do you want a CLI in CI? Continuous sync from a repo, pull-request review of translations, a command that fails the build on missing keys — these are real requirements for some teams, and they are exactly what Localize Your App does not have. If you need them, choose a different tool deliberately.

File format support matters less than those three questions. Most of these tools handle some combination of .strings, .xcstrings, strings.xml, .arb, i18n JSON and XLIFF. What you are really choosing is the operating model: a subscription, hosted words, per-word human work, or one-time credits.

Pricing checked 28 August 2026 on each vendor's own pricing page. Sources: String Catalog, SimpleLocalize, Localazy, Crowdin, OneSky, Lokalise, Blend, Phrase, Smartling, Localize

Localize Your App

Upload an iOS, Android, Flutter or React Native localization file, pay credits, download translated files in the same format. Credit packs are one-time and credits do not expire; one credit covers one string into one language. Supported formats are .strings, .xcstrings, strings.xml, .arb, i18n JSON and XLIFF.

What it does not have: a CLI, CI/CD integration, a translation marketplace, human translators for hire, or continuous sync from a git repo. If any of those is a requirement, this is the wrong product and one of the tools below is the right one. The indie-focused comparison against Lokalise works through the trade-off in more detail.

String Catalog

The closest thing to a direct equivalent in this list, and the one an iOS developer is most likely to be choosing between. It is git-native: translations arrive as pull requests in GitHub, GitLab or Bitbucket, reviewed as diffs like any other change. Entry is $15/mo for up to 40 languages and 3,000 base string keys.

Better than Localize Your App if you already review everything in git and want translations to show up as diffs rather than as a file you download and merge by hand. That workflow is the whole product, and Localize Your App has no git sync at all. The detailed comparison covers where each model breaks down.

SimpleLocalize

A small self-serve platform with prices published in the open, in euros. The Community tier is free for 250 translation keys, ten languages and one seat; paid tiers start at €12/mo and lift the key ceiling while adding seats.

Better than Localize Your App if you will keep adding strings, you want more than one person in the project, or you need a living catalogue rather than a one-time export. The free and Developer tiers are sized almost exactly for an indie app still accumulating copy. The SimpleLocalize comparison covers the euro pricing and the key ceilings.

Localazy

Free up to 200 source keys, with unlimited languages and seats even on that tier — the most generous free offer in this list. Paid plans start at $41/mo and scale by key count rather than by language.

Better than Localize Your App if 200 keys is enough to validate the workflow before you pay anything, or you want the tool to remember what is already translated as keys accumulate. It is still a subscription: you are paying for the platform to stay available, not for a single file job. The Localazy comparison works through where that free tier stops being free.

Crowdin

A collaboration platform many teams already know, priced on hosted words — words multiplied by target languages — starting at $50/mo after a free plan. It grants free licences to qualifying open-source and academic projects.

Better than Localize Your App if your app is open source, you need translators and reviewers working in one place, or hosted-word pricing suits a project that adds languages gradually. It is built around an ongoing corpus rather than a one-off upload.

OneSky

Translation bought as a commodity rather than as software: $0.005/word for AI, with human review and human translation available per word and no minimum order.

Better than Localize Your App if you specifically want human translators or a human review pass without taking on a platform subscription. Localize Your App does not offer humans for hire; OneSky does. If the output has to be produced by a person, that is the dividing line, and the OneSky comparison prices it out.

Lokalise

A full translation management system for teams who treat localization as a function rather than a task, starting at $144/mo with no free tier and a 14-day trial.

Better than Localize Your App if several people own strings and the realistic alternative is a spreadsheet. An indie shipping one binary does not need the entry plan; a localization team at a scale-up plausibly does.

Blend

An agency rather than a self-serve tool. Full-service human translation from $0.12/word, with a dedicated account manager available as a monthly add-on and subscription plans quoted rather than published.

Better than Localize Your App if you want to hire people to run translation for you rather than click through a web interface. Localize Your App has no humans for hire and no account manager; Blend is the opposite shape of product, as the Blend comparison sets out.

Phrase and Smartling

Both publish no price at all. Phrase's pricing page ends in a demo booking; Smartling's carries no number of any kind. Both are enterprise systems, and Smartling attaches managed translation services on top.

Better than Localize Your App if you already have a localization manager and procurement expects a demo, a contract and a named account team. Neither will give a solo developer a useful answer, and that is not a criticism — a solo developer is not who they are selling to. The Phrase and Smartling comparisons cover what buying without a public price involves.

Localize (localizejs.com)

Publishes no price and routes to a sales contact. More importantly it localizes websites and web apps, not mobile string files.

Better than Localize Your App if the thing you need translated is a website rather than an .xcstrings or strings.xml file. Its presence in "app localization tools" searches is largely a naming collision.

Subscription, per word, or once

Most tools here are subscriptions: you pay monthly for keys, seats, hosted words or a plan name. That matches work which never finishes — new screens, new locales, translators in the loop, a CLI in CI. Crowdin, Localazy, SimpleLocalize, String Catalog and Lokalise all live there, and Phrase and Smartling do too behind a demo.

Per-word pricing matches a different job: you have source text and you want AI, review, or a human, billed on volume with no seats. You are not renting a catalogue, you are buying sentences.

One-time credits are the third model. You are buying "this file, these languages", not access to a platform — which is precisely why there is no CLI, no CI/CD, no marketplace and no git sync. If those absences matter to you, the subscription and per-word tools above are the right answer, not a future version of this one. The cost guide puts real app sizes through all three models, and the complete localization guide covers everything around the tooling decision.

Frequently asked questions

Who wrote this app localization tools roundup?

Localize Your App, which is one of the tools listed. That is disclosed in the opening paragraph, and every competitor entry states the cases where that competitor is the better choice.

When were these prices checked?

On 28 August 2026, on each vendor's own pricing page. Phrase, Smartling and Localize publish no public price at all, which is noted rather than estimated.

What can Localize Your App not do?

There is no CLI, no CI/CD integration, no translation marketplace, no human translators for hire and no continuous sync from a git repository. If you need any of those, one of the subscription tools in this roundup is the right answer.

Which tool should I pick if my strings change every sprint?

A platform with a living key catalogue — SimpleLocalize, Localazy or Crowdin, or String Catalog if you would rather review translations as pull requests. One-time credits are the wrong model for copy that churns continuously.

Is SimpleLocalize priced in dollars?

No, its published plans are in euros. That is worth checking against your own currency before comparing its tiers directly with the dollar-priced tools in this list.