SMS Instant vs OKJ Flex
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SMS Instant
Receive SMS messages anonymously with temporary phone numbers. Protect your private number by using disposable digits for service registrations and urgent SMS needs. Get a new number each time you open the app.
- Disposable phone numbers
- Receive registration messages
- Anonymous SMS reception
- No registration required
- Secure private number protection
- New number on each launch
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You can easily get disposable phone number for SMS without registration. Disposable SMS phone numbers can be used to receive registration messages from Facebook, Twitter, Paypal, Alipay and more. It's very secure because you can receive messages without exposing your private phone number. [Useful at times like this] - When a temporary telephone number is required for trial registration of the service. - When you want to receive SMS anonymously. - When you need a phone number for SMS in a hurry. - When you want to receive a message without giving your private phone number. [Simple Usage] 1. A disposable SMS phone number is automatically assigned when the app starts. 2. Give the sender the disposable phone number. 3. You can receive the sent SMS messages while the app is running. 4. A different phone number will be assigned each time you launch the app. [Terms & Conditions] https://www.hayaya.net/terms-conditions/temporary-sms.html [Privacy Policy] https://www.hayaya.net/privacy-policy/temporary-sms.html
OKJ Flex
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Inspect material response from the surface outward with OKJ Flex. Explore focused calculations for coatings and flexible structures. Begin with surface energy to examine interaction-related values. Review coating adhesion when comparing bonding conditions. Study deformation balance across changing material responses. Assess separation risk using the provided calculation inputs. Explore elastic response when a material bends or returns. Consider fatigue resistance under repeated movement. Review migration effects that may influence material behavior. Examine integrity retention during ongoing use. Look at degradation-related values for aging comparisons. Explore flex crack resistance for repeated bending conditions. Enter relevant values in a clean, direct calculation interface. Run each calculation and review a readable output. Switch between surface, coating, and flexibility topics. Use results to identify differences worth further investigation. Keep complex material concepts approachable for day-to-day review. Support early-stage comparisons without lengthy manual arithmetic. Revisit individual properties as evaluation needs change. Interpret each result using the conditions and units entered. Treat calculations as references rather than certified test findings. Confirm important decisions through appropriate material testing. OKJ Flex keeps coating and flex calculations within easy reach.
Screenshots
Verdict
The clearest difference is in-app purchases: OKJ Flex at none against SMS Instant's 2. OKJ Flex also leads on ads (none vs shown). SMS Instant's advantage is iOS requirement (12.0 vs 15.0). On price 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. SMS Instant sells 2 in-app purchases, starting at $1.99 per month. OKJ Flex asks for nothing beyond the download.
| Parameter | SMS Instant | OKJ Flex |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (62 ratings) — better | — |
| Positive reviews | 11.8% of reviews | — |
| Number of ratings | 62 — better | — |
| Update frequency | Every 5 months | — |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 68 MB | 8 MB |
| Age rating | 4+ | 9+ |
| Developer | Hayato Shimizu | Samuel Boyd |
In-app purchases
SMS Instant
- Premium (Monthly plan)$1.991 Month
- Premium (Buying out)$19.99
OKJ Flex
No in-app purchases









