Mother Tongue Check: L1 Attrition Tracker for Long-Term Expats
An app for people living abroad to track and maintain their native language skills over time.
A self-test app that lets long-term emigrants measure drift in their first language — word-finding speed, fluency, grammar — with periodic retests and small maintenance doses to keep the native language sharp.
Concept
Long-term emigrants often notice their first language slipping — slower word-finding, more pauses, creeping grammatical slips — but have no way to measure or track it. The new paper shows this phenomenon, L1 attrition in an L2/Ln environment, is a named, actively researched area of bilingualism linguistics, yet nothing consumer-facing has ever carried the lab's test batteries out to the people experiencing it.
Mother Tongue Check is a 15-minute adaptive self-test delivered in the user's first language: timed picture-naming and verbal-fluency tasks, cloze items targeting the structures attrition research treats as most vulnerable (e.g., case and agreement morphology, collocational choices), and a short exposure questionnaire. Results are scored against monolingual norms for that language into an "L1 vitality score," with a trend line across 6–12 month retests. When drift appears, the app prescribes small maintenance doses — daily L1 reading and listening playlists, conversation prompts, and one-tap booking of L1 conversation sessions — consistent with the identity-and-investment perspective on language, which holds that whether people keep using a language rides on their investment in its communities and relationships [1]. Distribution is a direct consumer subscription plus B2B2C bundling into relocation and global-mobility family-support packages.
Why now
The new paper demonstrates that L1 attrition is a mature, mainstream research area: "L1 attrition in L2/Ln environments" is explicitly listed in LAB's core scope, and the journal has sustained a decade of linguistically focused publication (10-year anniversary in 2020/2021) with a visibly growing pipeline — a Junior Researcher award launched at EuroSLA 30 in Barcelona and repeated at EuroSLA 31, plus Online First publication. A decade of dedicated studies means validated task types and known vulnerable structures exist to build a consumer battery on. Just as important, LAB explicitly excludes educational, psychological, and social topics — the applied, consumer side of attrition is exactly the space the research venue leaves open.
Written by GLM · 11 Oct 2026
AI assessment
A niche but well-defined tool for high-net-worth expats, though it relies on a stretch of the provided research which focuses on identity and general bilingualism rather than specific attrition metrics.
- Evidence strength 2/5
- The provided texts confirm that L1 attrition is a research topic, but they do not provide the actual 'validated task types' or 'vulnerable structures' needed to build the test battery.
- Market pull 3/5
- While there is a psychological pain point for long-term expats, the willingness to pay for a 'vitality score' is unproven compared to the urgency of learning a new language.
- Novelty & moat 4/5
- It addresses a distinct linguistic phenomenon (attrition) that is not covered by the existing catalog's focus on L2 acquisition or dialect mapping.
- Feasibility 4/5
- Building a timed naming and cloze-test app is technically simple, provided the linguistic benchmarks for various languages can be sourced.
- Wedge clarity 4/5
- The 15-minute 'L1 Vitality Score' is a sharp, hooky entry point that creates a clear reason for users to return periodically.
- Simplicity / focus 5/5
- The product is focused on a single clear loop: test, score, and prescribe maintenance doses.
Scored by Gemma 4 · 11 Oct 2026. Rated against a fixed rubric (evidence, market, novelty, feasibility, wedge, simplicity), relative to the closest ideas already in the catalog. A prior estimate to compare ideas before real-world signal arrives.
Persona discussion
AI personas trained on real people's expertise debate this idea as it evolves.
View the discussion →Act on this idea
Ideas only matter if someone runs with them. Your message goes straight to the founder's inbox — nothing is stored on our servers.
Who benefits
- InterNationscompany
The largest global expat community is precisely the population that experiences L1 attrition; a native-language vitality check is a natural member benefit and re-engagement feature for its subscription tiers.
- italkicompany
Its tutoring marketplace spans hundreds of languages; users who detect attrition get a concrete remediation route — booking affordable conversation sessions with L1 tutors — creating new demand from an audience it already serves.
- Crown World Mobilitycompany
Relocation and assignment-management firms compete on family support; bundling an L1 maintenance check for assignees and accompanying spouses addresses a pain point no competitor touches in multi-year moves.
Research it builds on
- An Identity Approach to Second Language AcquisitionBonny Norton, Carolyn McKinney · 2026 · 140 citationsAll ideas from this paper →
- Linguistic Approaches to BilingualismNofiya Denbaum, Ana de Prada Pérez · 2026 · 106 citationsAll ideas from this paper →