I voted for English to Arabic, but would love to see English to Bengali.
Nobody else? Okay, maybe not the most practical suggestion.
Just commenting to confirm that I had the same issue... for C'est parfait ! and for Oui, j'adore ! It would mark my pronunciation of the words correct (in green), but the exclamation mark would be marked as incorrect (in red), and it would ask me to repeat or skip the phrase. Finally ended up marking "skip" for each of those.
Unrelated but also in the convo: When I first tried the first French exercise on my laptop (Je voudrais un tee-shirt), it could not understand anything I said. I tried them again on my mobile app, and it worked much better (Although not with that sentence, which it recorded as Je voudrais un t-shirt and thus wrong). This could be a hardware issue (better voice recognition on phone, which has French language added), of course, but thought I'd mention it.
So many things to love. Starting with your list:
The minimalist design - oh my goodness yes. I'm so tired of gaudy, overdone designs in every app that's trying to sustain me through my supposedly limited attention span. I appreciate the clean and calm.
Milestones and progress at bottom; separate stats page - yes, both of these. I appreciate the understated but immediate feedback on where I'm at, and being able to get a more thorough look at how far I've progressed through the content, how that relates to reading text.
The fact that it teaches words by frequency - Absolutely appreciated. Especially appreciate how you have them set up so that it's not thematic from the start, like most programs' beginnings.
The example sentences - While I don't necessarily love the business focus that I hit early in Spanish, I can appreciate that they are frequent words and thus included. Otherwise, I've been impressed with selection of sentences, with some using more complex grammar than I can yet decipher, but it gives me that first exposure. Related, I also love the reinforcement of vocabulary throughout your example sentences. For example, I first learned "señale" as a new word in a sentence. Maybe 5 minutes later, I learned another new word but "señale" was part of the sentence. Reinforcement without testing that word again! I've seen this over and over again, and it's a strategy that has really been missing from many other programs I've tried.
The voices that read the sentences - I don't know about sexy, but the voices are truly great. They are clear, distinct, faster paced without being incomprehensible, and consistent throughout. Voice recordings vary in quality/volume/clarity in other programs, so I appreciate the selections (for French and Spanish, at least).
(haven't seen the forums until today; grammar is definitely helpful on a few words, but hasn't been one of my key strategies since this is based on contextual learning. I get more grammar through my supplemental learning, and don't crave it here--contextual learning and simplicity is perfect for this!)
And some other things:
Some offline - I highly appreciate that I've been able to use the app for a while even though I'm offline, not connected. It meant I could continue to train in one of my languages while on a flight recently, and that in general I don't have to worry about maintaining steady connection (hello Metro). Don't know how far I can continue offline, and haven't been able to switch languages while offline, but it's still better than any other apps I've tried. (Of course, would love to have the option to have everything work offline...)
Simplicity of offerings - You do a few things, and you do them really well. As much as I really want other offerings (videos with subtitles! long passages! audio to follow those passages! Live conversation! Role playing! Compose your own text!), there is immense value in what you already offer, and I'd hate to see you suffer by stretching too thin. The contextual, production-based, smart SRS training that allows you to test into a higher level and is useful to intermediate learners is not something I've found elsewhere, and really needed. (haven't tried your conversations much, seem to be less enthused with those from my limited exposure, but I'm still happy with the primary service!)
Backed by research - Everything I've been reading up on emphasizes contextual learning of words, reducing the use of translation as much as possible, SRS, etc. This fits in with this. There are some things missing, but I don't think you'd be able to scale them to this app (recall images--Memrise tries to do this but it doesn't really work; pronunciation trainers--haven't seen anything effective for this yet). But what you can do? You've developed into this.
Gentle gamification - There is gamification, but it's not extra. There's goals to meet, but there's no made-up story line, no incentive for cheating, no daily notification or guilt-trip to get me to come back in if I need to take some time off, nothing superfluous. This ties back into the minimalism mentioned above, but it goes beyond design to include the experience. It's simple, enticing for those of us that are intrinsically motivated, and I love it.
"Immersion" via text - Tying back into the comments on contextual learning, I love that I'm not translating full sentences--I'm reading full sentences with one word missing, and only that word is a translation. It would be hard to do this without that one word of translation, so I can't begrudge that, but otherwise reading everything in my target language? Talk about a confidence builder! And for those sentences I just can't figure out, there is the optional translation--I pull that down, review the sentence to decipher what I was missing, and then the next time I see the sentence I usually don't need the translation again.
Not just for beginners - I'm a beginner in Spanish, but have a fair amount of imperfect French under my belt. I'm missing some basic words and a lot of grammar, but also have an odd collection of advanced terminology. So, testing in to a higher level to skip all the basic stuff I definitely know? Invaluable. This app has really helped me start to pull that all together in a way that verb drills can't, because I"m not training on a particular verb tense at one time (and thus committing the structure to short-term memory), I'm training on all of them as used in the language (and thus getting used to thinking of those verb tenses in different contexts). There's a lot of beginner friendly apps, and not a lot of intermediate/advanced, so this definitely meets an important need.
So... kind of a lot. Sorry not sorry for the book, but since I know there's real people on the other side of this technology, I decided it was worth laying this all out. I appreciate the work you do, that you've created this app that is essentially what I had spent a couple years looking for. Thank you!
Why not go the alternative "ads way" for "Lingvist Free" for 3,000-5,000 Non Plus/Pro users (not <3000)
(My current status: French 3836, Spanish 575)
I hate ads ever so much... but I do think this may be a good idea. Anecdotal evidence, I know, but: I found Lingvist and decided to use it because I need more French training, but was frustrated with Bliu Bliu limitations, too advanced for Duolingo, and didn't think Memrise was super effective in personal recall for advanced French (after months of use-answers were multiple choice instead of production). Lingvist, while it doesn't have longer text passages to read, met an essential need for me by being adaptable to my current level, being smart enough not to show me words I know 20,000 more times after I get it right the first time (cough Memrise), and providing me recall training where I have to remember and correctly produce the word. In short, it is a wonderful, adaptable resource that is relevant to me after years of imperfect and sporadic French learning.
I have since started using it for Spanish, where I may have skipped a few words but not a ton. I'm at the beginner level there, and could easily use Duolingo, Memrise, and a host of other programs to keep training at a beginner level: There's stiff competition at the beginner level.
I absolutely love Lingvist, and have just bought the unlimited subscription for the full year of 2018. I have not bought a subscription for any other app at this point, as I hate subscription services (getting recharged if I forget to cancel), and don't usually love something that much.
So why the long story? To say this: If I hadn't found this app until 2018, I would have tested into the 3,000 word mark for French, and would have never been able to use it long enough to find out how much I love it. It's difficult to find something that is effective and useful for the intermediate/advanced level, so I'd love to see some way that you can allow those that test higher to still try out the service.
I don't know any of the tech that goes into this, but an alternative might be letting a new intermediate/advanced person hit 500 or 1000 new cards, instead of an absolute vocab cap no matter the level. Thus, their cap may be higher, but as they haven't needed the first 3,000 words, it still gives them an opportunity to use/try the service before hitting their cap, and then decide if it's worth investing to continue (as I did!).
(Side note: no hate to Duolingo, Memrise, Bliu Bliu, etc... They are useful for certain strategies--Duo for absolute beginners, Memrise for sheer vocab, Bliu Bliu for comprehension until you quickly hit the timed limits--and I still recommend them to others accordingly, but none of them worked for my French like Lingvist does!)