SlimCal vs KnowWhen
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SlimCal
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Meet SlimCal: Your AI Calorie & Wellness Companion for Women SlimCal helps you understand your body, track your calories, and stay in sync with your cycle. Designed for women who want a smarter, more balanced approach to health, SlimCal combines AI-powered nutrition tracking, cycle insights, and personalized wellness guidance in one beautifully simple app. See your daily progress at a glance. SlimCal’s clean dashboard shows your calories, macros, and wellness insights in one place so you always know where you stand. Powerful features designed for your body: Snap your meals and let AI do the rest Take a photo of your food and SlimCal instantly recognizes ingredients, counts calories and macros, and provides a detailed nutrition breakdown. Track calories without the stress Log meals effortlessly and stay on top of your calorie goals with a calorie tracker built for simplicity and accuracy. Stay in sync with your cycle Track your menstrual cycle, predict upcoming periods and ovulation, and receive guidance tailored to each hormonal phase. Understand how food affects your body Go beyond calories. See how meals may influence your energy, mood, bloating, and overall wellbeing. Get smart AI wellness insights SlimCal provides personalized suggestions—from small food swaps to smarter meal choices—to help you feel and look your best. Watch your progress over time Track weight trends, nutrition habits, and wellness insights through clean, motivating charts that help you stay consistent. SlimCal blends science, AI, and self-care into one seamless experience. It’s not just about counting calories—it’s about understanding your body and building healthier habits that last. Start your smarter wellness journey today with SlimCal. Disclaimer: SlimCal does not provide medical advice. All insights and recommendations are for general wellness and educational purposes only. Please consult a healthcare professional before making changes to your nutrition, lifestyle, or cycle management. AI meal scanner, advanced insights, cycle analytics, and premium wellness tools require a subscription. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://slimoraapp.com/privacy-policy
KnowWhen
This app offers simple, timely guidance for husbands based on their partner's cycle. It helps users understand when to offer support, listen, or give space, fostering better connection and reducing relationship tension.
- Daily simple guidance
- Phase-based reminders
- Private logging for patterns
- Discreet data storage on device
- Guidance on giving space
- Guidance on offering support
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100% FREE => Hey husbands—stop guessing. KnowWhen gives simple guidance based on her cycle so you can support her better, at the right time. Most relationship tension isn’t about effort. It’s about timing. KnowWhen helps you respond with more understanding—when to listen, when to give space, and when to lean in. What you’ll get: - Daily, simple guidance (not essays) - Phase-based reminders so you’re not guessing - Optional private logging to spot your own patterns over time - Built for discretion: your data stays on your device KnowWhen helps you know when to… • Give space • Offer support • Listen instead of fix • Lean in • Reconnect Privacy first. No accounts. No cloud. No tracking. Important KnowWhen provides informational insights. It is not medical advice and not a medical device. It describes population-level tendencies, not a guarantee of your partner's behaviour. Guess Less. Connect More. View Apple EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: KnowWhen at none against SlimCal's 2. SlimCal's advantage is iOS requirement (16.0 vs 18.0). On price, update cadence, ads 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
Both are free to download. SlimCal sells 2 in-app purchases, starting at $9.99 per month. KnowWhen asks for nothing beyond the download.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 4, 2026 and October 10, 2026 respectively.
| Parameter | SlimCal | KnowWhen |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | — | Free |
| Devices | iPhone | iPhone |
| Requires iOS | 16.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 48 MB | 6 MB |
| Age rating | 12+ | 17+ |
| Developer | Regina Rachma Agnia | Launch Round |
In-app purchases
SlimCal
- Slimora Pro Monthly3 Days trial$9.991 Month
- Slimora Pro Yearly3 Days trial$49.991 Year
KnowWhen
No in-app purchases









