Comparison

Thyroid Tracker vs Soln

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Thyroid Tracker

Features
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Thyroid Tracker is the daily companion for people managing thyroid conditions. Log TSH, T3, T4 and other lab values, track your medication and follow-ups, and turn scattered health data into clear trend charts. Whether you live with hypothyroidism, hyperthyroidism, Hashimoto's, thyroid nodules, or you're recovering from thyroid surgery, this app keeps everything in one place. 【CORE FEATURES】 • Lab Tracking Record TSH, FT3, FT4, T3, T4, TG, TGAb and more. Auto-generated trend charts show how your levels change over time. • Medication Reminders Set reminders for levothyroxine (Euthyrox) and other thyroid meds. Supports alternate-day dosing and different doses for each day of the week — built for real prescription schedules. • Follow-up Reminders One tap to schedule refills, doctor visits, and periodic lab checks. Common cycles come as quick templates. • Health Records Log every visit, test, and symptom change to build a complete personal health history. • Charts & Reports All your data rolls up into clean charts you can show your doctor at the next visit. 【WHO IT'S FOR】 - Hypothyroidism & hyperthyroidism patients tracking labs long-term - Hashimoto's and thyroid nodule patients - Post-thyroidectomy patients managing medication and follow-ups - Anyone taking daily thyroid medication 【WHY THYROID TRACKER】 Built by a papillary thyroid carcinoma survivor who lived the daily routine — every feature solves a real need. No fluff, just a tool that genuinely helps patients. 【PRIVACY】 - Your health data stays on your device - We never sell personal data - No personalized ads Questions or feedback? Email support@joyzr.com (or via in-app feedback). Every message is read. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Soln

Features
Read full description

Soln is a sleep engine built on cognitive load theory. Different from other sleep apps Most sleep apps are just players — they start audio and leave you to it. Soln calculates how hard it will be to fall asleep tonight, decides which layer to start at and how long to stay there, then stops when you're out. You don't have to manage anything. Five audio layers · Silent preparation — nothing playing, just space for your mind to settle · Minimal white noise — a steady background to mask outside noise · Heart rate-synced white noise — audio tempo follows your heart rate; as it slows, so does the sound · Tonal fade — frequency gradually drops, sliding your brain from alert to relaxed · Semantic drift — soft, loosely connected speech that gives your mind something to dissolve into instead of looping the same thought (paid) How long you spend on each layer isn't fixed — it depends on how you're doing tonight. Apple Watch auto-stop When you fall asleep, Apple Watch detects it. Soln fades the audio out over two seconds, then stops. No timer to set. No sudden silence to wake you (paid). Nightly assessment Before bed, based on today's mood and last night's sleep, Soln estimates how hard it'll be to fall asleep and gives you an optimal bedtime window and expected sleep onset time. In the morning, three scores: reaction, memory, and mood. Sleep well, score well. Sleep poorly, score reflects that. Straightforward. Full sleep history A three-color ring for each night. Long-press any day for that night's detail and sleep-onset timeline. One-time purchase Free for 7 days, full features included. After that, a one-time purchase permanently unlocks everything. Tied to your Apple ID — restore on any new device. No ongoing charges.

Screenshots

Thyroid Tracker4 screens
Soln4 screens

Verdict

The call

The clearest difference is update cadence: Thyroid Tracker at every 4 days against Soln's every 3 weeks. Thyroid Tracker also leads on iOS requirement (15.6 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Thyroid Tracker sells 3 in-app purchases, starting at $2.99 per month and Soln sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Thyroid Tracker ships an update every 4 days, Soln every 3 weeks. The most recent releases landed on September 5, 2026 and September 9, 2026 respectively.

Scorecard2 real differences · 4 level
Thyroid Tracker versus Soln: the parameters behind the verdict, then further details
ParameterThyroid TrackerSoln
PriceFreeFree
Update frequencyEvery 4 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS15.6 — better17.0
Further details — not scored
Size38 MB3 MB
Age rating4+4+
DeveloperChengdu Xingguan Technology Co., Ltd.Nan Yu

In-app purchases

3 purchases

Thyroid Tracker

Subscriptions2
  • Premium Monthly$2.991 Month
  • Premium Yearly$5.991 Year
One-time1
  • Lifetime$15.00
1 purchases

Soln

One-time1
  • Unlock Soln$5.99

Questions

Is Thyroid Tracker free?
Thyroid Tracker is free to download, with in-app purchases available.
Is Soln free?
Soln is free to download, with in-app purchases available.
Do Thyroid Tracker or Soln have ads?
Neither Thyroid Tracker nor Soln shows ads.
Which is updated more often, Thyroid Tracker or Soln?
Thyroid Tracker ships an update every 4 days, and Soln every 3 weeks. Most recently, Thyroid Tracker was updated on September 5, 2026 and Soln on September 9, 2026.

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