Skip to main content
AIDiveForge AIDiveForge

FreeLingo vs InputDojo

Bottom line

FreeLingo is open source and InputDojo is not. You can run FreeLingo on your own machine or server; InputDojo is hosted by the vendor.

Which one should you try?

FreeLingo

Freemium

Best for Self-directed learners practicing speaking skills without a human tutor

Visit FreeLingo See full review

InputDojo

Freemium

Best for Language learners preparing for standardized exams (JLPT, HSK)

Visit InputDojo See full review

Pricing, capabilities and platforms side by side. Prices are as of the "Pricing checked" date in the table.

FreeLingo

FreeLingo

Freelingo pairs conversational AI chat with real-time voice feedback and spaced-repetition flashcards, covering the gap between passive study apps and expensive live tutoring. The free tier gives you lesson assessment and flashcards — which means you can gauge the tool before committing. Voice conversation and AI chat are paid-only features, so the free experience alone does not replicate a real practice session. Self-hosting is available, which matters for learners or institutions where sending conversation data to a third-party server is not acceptable. The ceiling arrives when a learner needs nuanced grammar correction mid-sentence or culturally specific idiom coaching that a scripted AI response cannot reliably provide.

InputDojo

InputDojo

The core loop is structured around proficiency levels: you work through vocabulary in context, get speech feedback on conversation practice, and the system reschedules reviews based on what you're actually forgetting. That beats flashcard apps that treat every word the same. The constraint shows up when you need niche language pairs or want to export your progress data — the vendor does not describe an open API, so your learning history stays inside the platform. Teams using this to supplement formal instruction get the most mileage; learners who want to pipe data into a custom dashboard hit a wall fast.

AttributeFreeLingoInputDojo
PricingFreemiumFreemium
PriceFree plan; Premium €9.95/month shown with €5.95 offer, or €99.50/year shown with €59.50 offer$7.99/mo
Pricing checkedOct 19, 2026Jun 11, 2026
Free trial7 days14 days
Open sourceYesNo
Has APINoNo
Self-hosted optionYesNo
PlatformsWebWeb, iOS, Android
Pros
  • On-demand AI conversation practice with no scheduling requirement, so learners accumulate speaking hours without coordinating with another person's calendar.
  • Real-time pronunciation feedback during voice sessions, which means errors are caught in context rather than discovered after practice has already reinforced the wrong pattern.
  • Spaced-repetition flashcards integrated into the same platform, so vocabulary retention does not depend on a separate app that breaks the learning workflow.
  • Self-hosted deployment option, which means teams or institutions with data-residency requirements can run the platform without routing learner conversation data through the vendor's servers.
  • Free tier includes lesson assessment and flashcards, so a learner can evaluate whether the tool matches their level before unlocking voice and chat features.
  • Exam-aligned study plans for JLPT and HSK mean practice time maps directly to what standardized tests score, so you're not drilling vocabulary that won't appear on the test you're sitting.
  • Vocabulary presented in native-media context rather than textbook sentences, which means words land with the register and colocation patterns you'll actually encounter in listening or reading sections.
  • Instant speech feedback on conversation practice closes the gap that silent review apps leave — you hear whether your pronunciation is off before bad habits calcify.
  • Spaced repetition tuned to individual mastery levels, so the system reschedules reviews based on where you actually struggle rather than applying a one-size decay curve to every learner.
  • Mobile and web access from a single account, so review sessions fit around a schedule that doesn't include dedicated study blocks.
Cons
  • Voice and AI chat — the core practice features — are locked behind a paid subscription, so a learner testing the free tier cannot assess the quality of the conversation engine before committing; teams evaluating the tool for an institution cannot validate its primary value from the free access alone.
  • The AI conversation partner has no documented mechanism for adaptive curriculum adjustment based on a learner's specific error patterns over time; learners who need a tutor that notices recurring grammar mistakes across sessions and builds correction into future lessons will hit this wall and move to a platform with a human tutor component or a more structured adaptive engine.
  • No API is available, which means organisations wanting to embed Freelingo's conversation practice into an existing learning management system or internal training portal cannot do so programmatically — they are limited to directing learners to the standalone product.
  • No API and no data export path: every progress metric, vocab list, and mastery score lives inside the platform. Learners or institutions that need to feed data into an LMS or run their own retention analysis have no route out — they're maintaining a parallel tracking system manually.
  • AI-powered features — personalized plans, speech feedback — are paid-only features. The free tier does not deliver the core differentiator, which means evaluating whether the tool actually fits your learning style requires committing to a paid account.
  • Learners whose goal is conversational fluency in an unsupported language pair, or who need a tutor-like correction model beyond speech feedback, will hit the ceiling of what a structured app can offer and move to a platform with live tutors or a larger language coverage list.

Made up your mind?

FreeLingo

Freemium

Best for Self-directed learners practicing speaking skills without a human tutor

Visit FreeLingo See full review

InputDojo

Freemium

Best for Language learners preparing for standardized exams (JLPT, HSK)

Visit InputDojo See full review

Related comparisons

Free trials & curated lists

Specs come from each tool's own site and docs (how we test). AIDiveForge is editorially independent.

Browse tools · Affiliate Disclosure · Privacy · Cookies · · Email Policy · Terms · DMCA