Language Learning App Development

Generic language platforms were built for everyone, which means no one in particular

Duolingo spent years and hundreds of millions of dollars building their learning engine. A language school, publisher, or ed-startup can't replicate that by buying a white-label SaaS platform that takes 30% of revenue and locks learner data behind their dashboard. Custom language learning app development builds the product around your curriculum, your target languages, and your learner journey, whether that's structured CEFR-aligned lessons, AI conversation practice, a live tutor marketplace, or all three.

  • Spaced repetition vocabulary system and speech recognition with pronunciation scoring

  • AI conversation practice powered by LLMs with grammar correction and vocabulary suggestion

  • Gamification, streaks, XP, leaderboards, and badges, built to drive daily practice

  • Live tutor booking, video sessions, and progress analytics by skill and CEFR level

Recent outcomes

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6× deeper insights

Text-based interviews converted to automated phone calls

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20k+ txns day one

Manual invoice OCR across 40+ gas stations

Loyalty · Retail

1,062 users in 4 weeks

SuperValu & Centra loyalty platform with receipt validation

SaaS · Logistics

2,000+ shipments yr 1

Multi-carrier shipping hub for Indonesian eCommerce

4.9
on Clutch
See our work

The problem

Sound familiar?

  • Building a language learning app where learners need speaking practice but human tutors at scale are too expensive and basic chatbots don't correct pronunciation?

  • Your language course content is ready but off-the-shelf platforms take a large revenue cut and don't give you control over the learning path or learner data?

Short answer

RaftLabs builds custom language learning apps for ed-startups, language schools, and publishers. Language learning app development covers spaced repetition vocabulary systems, speech recognition and pronunciation scoring, AI conversation practice, structured lesson delivery by CEFR level, gamification mechanics, live tutor booking and video sessions, and progress analytics. Custom builds are appropriate when off-the-shelf platforms take a large revenue cut, restrict your learning path design, or don't give you access to learner data. Most language learning app projects deliver in 12-16 weeks at a fixed cost with full source code ownership.

Key takeaways

  • SM-2 spaced repetition scheduling is language-agnostic, but speech recognition and pronunciation scoring depend on the coverage of Azure Cognitive Services or Google Cloud Speech-to-Text for your target language.
  • AI conversation practice runs on a configurable system-prompt persona per scenario, so your content team defines conversation contexts without engineering work for each one.
  • Gamification mechanics (streaks, XP weighting, weekly-reset leaderboards) only drive retention when tied to real learning actions, not arbitrary point accumulation.
  • A focused app (vocabulary, lessons, basic gamification) runs $30,000-$70,000; adding speech recognition, AI conversation, and a tutor marketplace brings a full product to $80,000-$180,000.

Trusted by

Vodafone logo
Aldi logo
Nike logo
Microsoft logo
Heineken logo
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Energia Rewards logo

Language app delivery, by the numbers

products shipped since 2015
100+
recognition built-in
Speech
cost delivery
Fixed
week delivery
12-16

Built around your curriculum, not a platform's assumptions

Custom language learning app development builds the product around your curriculum, your target languages, and your learner journey, whether structured CEFR lessons, free-form AI conversation, a live tutor marketplace, or a combination.

Capabilities

What we build

  • 01
    Spaced repetition vocabulary system

    SM-2 scheduling calculates the optimal review interval per card from the learner's own performance history, with decks organised by CEFR level and a placement test setting the starting point.

  • 02
    Speech recognition and pronunciation scoring

    Phoneme-level alignment scores drive visual feedback and side-by-side playback against a native speaker reference, with progressive exercises from isolated phonemes to full sentences.

    Built with
    Azure · Google Cloud
  • 03
    AI conversation practice

    A configurable persona sets language level and correction style per scenario, with contextual grammar correction and vocabulary suggestions feeding back into the spaced repetition deck.

    Built with
    GPT-4o
  • 04
    Structured lesson delivery

    CEFR-banded lessons combine reading, listening, writing, and speaking in one session, with prerequisite checks and offline download for practice without connectivity.

  • 05
    Gamification and engagement mechanics

    Streak tracking with configurable freeze protection, difficulty-weighted XP, and weekly-reset leaderboards drive daily practice without penalising new learners.

  • 06
    Live tutor booking and sessions

    A tutor marketplace with timezone-aware booking, in-session whiteboard tools, and vocabulary auto-extraction feeding the learner's spaced repetition deck.

    Built with
    WebRTC · Stripe Connect

How we work

From scope to live language app

  1. Week 1
    01

    Curriculum and language scoping

    We map your target languages, content, and learner audience. You leave week 1 with a written scope document and a fixed-price quote.

  2. Weeks 2-4
    02

    Learning engine design

    Spaced repetition rules, gamification mechanics, and speech API selection designed against your target languages.

  3. Weeks 5-13
    03

    Build and integrate

    Vocabulary engine, speech scoring, and AI conversation built in parallel, tested against real learner scenarios.

  4. Final 2-3 weeks
    04

    Launch and content team training

    Content team trained on the authoring tools before full rollout.

Why us

Why language education businesses choose RaftLabs

  • 01
    Senior engineers build what they scope

    The engineers who assess your curriculum also build the solution. No bait-and-switch, no offshore handoff after the contract is signed.

  • 02
    Fixed price before development starts

    We scope the work, calculate the cost, and lock it in writing before any development starts.

  • 03
    9 years and 100+ products shipped

    Clients include Vodafone, T-Mobile, Aldi, Nike, Cisco, and Lockheed Martin. Track record building audio-driven, habit-forming learning products.

  • 04
    Gamification tied to real learning, not points

    Streaks and XP are calibrated to actual practice, not arbitrary accumulation that stops mattering.

  • 05
    You own the learner data

    No third-party dashboard sitting between you and your own learners.

Have a language learning app project?

Tell us your target languages, your content, your learner audience, and what the existing platforms can't give you. We'll scope the right product and give you a fixed cost.

Talk about your language app project

Related services

Language Learning App Development, scoped in one call.

Tell us what's broken. Within one business day you get a straight take on cost, timeline, and the right first step. No deck, no pressure.

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Frequently asked questions

We integrate with Azure Cognitive Services Speech SDK or Google Cloud Speech-to-Text, selecting based on phoneme-level accuracy for the target language. The API returns a phoneme alignment result with per-phoneme accuracy scores, rendered visually alongside playback of the learner's recording next to a native speaker reference. Feedback appears within 1-2 seconds.

The core architecture (spaced repetition, CEFR sequencing, gamification, xAPI persistence) is language-agnostic. Speech recognition coverage depends on the underlying API, Azure covers over 100 languages, Google covers over 125. Native speaker audio must be recorded or licensed per target language, and right-to-left or logographic scripts need specific front-end handling built in from the start.

Streak tracking uses a minimum completion threshold, not just opening the app. XP is weighted by exercise difficulty and accuracy, not volume. Leaderboards reset weekly so new learners can compete, and streak recovery offers at the moment of loss reduce the most common churn driver.

A focused app with spaced repetition, structured lessons, and basic gamification typically runs $30,000-$70,000. Adding speech recognition, AI conversation practice, and a live tutor marketplace brings a full-featured product to $80,000-$180,000.

Work with us

Tell us what you need. We'll tell you what it would take.

We scope Language Learning App Development in 30 minutes. You walk away with a clear cost, timeline, and approach. No commitment required.

  • Scope and cost agreed before work starts. No surprises. No obligation.
  • Working prototype within 3 weeks of kickoff.
  • Pay by milestone. You see progress before each invoice.
  • 60-day post-launch warranty. Bug fixes, UI tweaks, and deployment support. No retainer.
  • All conversations are NDA-protected.

Go deeper

Browse our case studies

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