Simplex by SMS vs Nextbox
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Simplex by SMS
This all-in-one platform uses AI to streamline sales and marketing for gym owners. It offers lead generation, automated workflows, reputation management, and a website builder. Seamlessly syncs automated marketing with personal team interaction for a personalized customer experience.
- AI-powered sales and marketing
- Lead generation from multiple sources
- Automated workflows
- Reputation management tool
- Website builder
- CRM/lead management
- 2-way sync with automation
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Calling all gym owners! Are you tired of juggling multiple systems to manage your sales and marketing efforts? Simplex Marketing System is here to revolutionize your gym's marketing game! Our all-in-one platform, powered by advanced AI technology, is designed to help you streamline your sales and marketing processes, increase efficiency, and drive more revenue. Our platform includes features such as lead generation from multiple sources, automated workflows, and a reputation management tool, all designed to build your gym's online presence and grow your customer base. Our website builder and CRM/lead management system allow you to manage all aspects of your gym's marketing and sales in one easy-to-use platform. But what sets Simplex Marketing System apart is our unique 2-way sync with automation. Our platform seamlessly integrates the experience delivered by automated marketing communications with the personal touch delivered by your team. Humans and robots can work together to provide your gym's customers with a personalized experience that drives results. Don't wait any longer to take your gym's marketing efforts to the next level. Join the thousands of businesses who have already discovered the power of Simplex Marketing System and experience the benefits of seamless automation and human interaction today!
Nextbox
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Nextbox makes makes it quick and easy to maintain inbox zero. You don't have to be a superhuman to rock your email any more. Just scroll through your feed and emails are marked read as you see them. Pin the ones you want to follow up on later and the rest will drop below them when your feed refreshes.
Screenshots
Verdict
The clearest difference is ads: Simplex by SMS at none against Nextbox's shown. Nextbox's advantage is update cadence (every 9 days vs every 3 months) and iOS requirement (14.0 vs 16.0). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Simplex by SMS ships an update every 3 months, Nextbox every 9 days. The most recent releases landed on November 3, 2026 and November 8, 2026 respectively.
| Parameter | Simplex by SMS | Nextbox |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 months | Every 9 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 16.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 347 MB | 22 MB |
| Age rating | 17+ | 4+ |
| Developer | Simplex Marketing System | Next Level Coder, LLC |
In-app purchases
Simplex by SMS
No in-app purchases
Nextbox
No in-app purchases









