Ring Sizer vs TankLog
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ring Sizer
This app transforms your phone into a precision tool for measuring ring sizes and finger dimensions. It helps you find the perfect fit for jewelry, convert between international sizing standards, and save multiple measurements.
- Instant ring sizing
- Finger length measurement
- Global size conversion
- Save and manage sizes
- Precision digital caliper
Read full descriptionHide full description
Find your perfect fit instantly, right from your pocket. Experience the ease of discovering your exact ring size without ever stepping foot in a jewelry store. Ringer Sizer: Measuring Tool transforms your phone into a precision digital caliper, giving you accurate measurements for any finger or piece of jewelry in seconds. Stop guessing. Start measuring. WHY Ringer Sizer: Measuring Tool? Buying rings online or planning a surprise engagement can be incredibly stressful when you don't know the right dimensions. Ringer Sizer: Measuring Tool solves this uncertainty by putting professional-grade sizing tools right at your fingertips. Whether you are shopping internationally, custom-ordering a wedding band, or trying to find your partner's size in secret, find the perfect fit with absolute confidence. PREMIUM FEATURES: (Please note: Access to the following tools requires an active Pro subscription) Instant Ring Sizing: Simply place an existing ring directly on your screen and adjust the on-screen circle to instantly discover its exact size. Finger Length Measurement: Easily and accurately measure your finger length and width using your device's screen to ensure the most comfortable fit possible for wider bands. Global Size Conversion: Instantly convert your measurements between US, UK, EU, Asian, and other international ring sizing standards. Shopping from overseas jewelers has never been easier. Save Your Sizes: Keep track of your measurements. Store sizes for yourself, your partner, family, and friends so you always have them handy when it's time to shop. UNLOCK FULL ACCESS To provide the most accurate and high-quality sizing technology, all functionality within Ringer Sizer: Measuring Tool is exclusive to our Pro members. Upgrade to Pro to instantly unlock the complete suite of measuring tools, global conversions, and sizing profiles. Download Ringer Sizer: Measuring Tool today and never order the wrong ring size again! * TERMS: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
TankLog
This app helps you meticulously track your aquarium's water chemistry, maintenance, and livestock. It offers detailed logging for water parameters, customizable schedules, and equipment inventory, all while prioritizing user privacy with no data collection.
- Water chemistry tracking
- Customizable maintenance schedules
- Livestock and plant inventory
- Equipment tracker
- CO₂ estimation
- Privacy-focused, no data collection
Read full descriptionHide full description
Built by an aquascaper, for aquascapers. Free. Local. Yours. TankLog is a free freshwater aquarium journal for planted tank and shrimp hobbyists. No login required. No subscription. It works fully offline, and everything stays on your device. Built for the people who track CO₂ levels, obsess over KH and GH for their neocaridina colony, and want to know when their nitrates started creeping up. Not a generic fish app trying to cover everything. WATER TESTING & PARAMETER TRENDS Log pH, ammonia, nitrite, nitrate, KH, GH, phosphate (PO₄), TDS and temperature. Every reading is graded instantly against your own target ranges, and Parameter Trends charts every test so you can spot slow pH drifts, creeping nitrates or KH swings before they affect your plants or livestock. CO₂ ESTIMATION TankLog calculates dissolved CO₂ from your pH and KH and shows it as a color-coded zone: very low, low, ideal, high or at risk. Essential for high-tech planted tanks. CARE SCHEDULES & ACTIVITY CALENDAR Schedule water tests, water changes, filter cleans, dosing, feeding and more. Get reminders when tasks are due, see overdue items on your dashboard, and browse your whole care history and upcoming dates in the Activity Calendar. DOSING, WATER CHANGES, FEEDING & CLEANING Log every fertilizer, supplement and treatment with product, amount and date. Log water changes, feedings with species tags, and cleaning tasks, each with its own schedules and history. ACHIEVEMENTS Earn badges for consistent testing, on-time care and great water quality. Tap any badge to see how you earned it. TANK NOTES Jot down anything that isn't a log, like a tap water test or a new plant on the way. Notes show up in your Activity Calendar. SIRI & SHORTCUTS Say "Log a feeding in TankLog" and TankLog opens the right form, ready to fill in. Or put your own shortcut on the Action button. EQUIPMENT, LIVESTOCK & PLANTS Record your lighting, filtration, CO₂ system, heater and pumps. Log fish, invertebrates and plants (with scientific plant names), plus dates and notes. MULTIPLE TANKS Manage up to 3 tanks for free, each with its own parameters, schedules, livestock and history. Need more? Up to 10 Tanks is an optional one-time upgrade, with no subscription. CLOUD SYNC (OPTIONAL) Use TankLog on more than one device, or want a backup? Cloud Sync is an optional one-time upgrade, with no subscription, that keeps your tanks in your own private iCloud. A lost or new phone doesn't mean lost logs, and every iPhone and iPad signed in to your Apple Account stays the same. There's no account to create. TankLog can't see your synced data, and it's never sold, shared or used to market to you. Turn it off, or delete it from iCloud, whenever you choose. YOUR DATA, YOUR WAY Export your complete tank history as a file anytime and import it on any device. No account needed. Your data is yours, always. No AI gimmick. No subscription. Every tracking feature free, forever. Just a well-built, honest tool from someone who loves this hobby as much as you do. Metric and imperial units · 12h and 24h time · Light and dark mode · iPhone and iPad
Screenshots
Verdict
The clearest difference is rating: TankLog at 5.0 against Ring Sizer's 1.0. TankLog also leads on monetization model (free vs freemium) and device support (3 vs 1). On price, update cadence, ads and in-app purchases 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
Both are free to download. Ring Sizer sells 2 in-app purchases, starting at $4.99 per 7 days and TankLog sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
TankLog holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively.
Ring Sizer ships an update every 3 days, TankLog every 6 days. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.
| Parameter | Ring Sizer | TankLog |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 5.0 (3 ratings) — better |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 3 days — better | Every 6 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Free — better |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 18.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Jack Oehling | John Katez |
In-app purchases
Ring Sizer
- Monthly$4.997 Days
- Yearly3 Days trial$24.991 Year
TankLog
- Cloud Sync$3.99









