One controls how your people reach applications. The other protects the application your customers reach, and proves it for the audit.
TL;DR
Osto vs Zscaler, in one line each.
Osto is the security stack and the compliance layer in one platform. Web and API protection, cloud posture, endpoint control, ZTNA, DLP and VAPT are modules Osto runs, and audit evidence comes out of them.
Zscaler is a zero trust access platform. Traffic from your users to the internet, to SaaS and to private applications is routed through its cloud and inspected, licensed per user across tiered editions.
The Osto vs Zscaler question is a question about direction. One platform governs traffic going out from your workforce. The other protects traffic coming in to the product you sell.
On this page
Osto vs Zscaler: the core difference in one line
Zscaler controls how your team reaches applications. Osto protects the application your customers log into, and gets you audit ready at the same time.
Inbound protection, plus compliance
Web and API protection, cloud posture, endpoint and device control, ZTNA, DLP, VAPT and code security, with compliance mapped from the controls Osto runs. ZTNA is one module here, not the whole product.
Outbound access control, per user
User to application traffic brokered and inspected in a cloud service, licensed per user with capability split across editions and add-on modules.
Osto vs Zscaler: the gap Osto fills
In an Osto vs Zscaler comparison this is the decisive point. Access control governs how your employees reach things. It does not stand in front of the application your customers log into, it does not run a penetration test, and it does not produce the SOC 2 evidence an enterprise buyer asks for before signing.
Buy Zscaler and you still buy this separately
- A web application firewall for your app and APIs
- A penetration testing firm, per cycle
- A compliance platform for audit evidence
- Security questionnaire responses, done manually
- Code scanning for SAST, SCA and SBOM
- A per user licence as the team grows
- An administrator to own policy and rollout
Buy Osto and this is already included
- Reverse proxy WAAP blocking OWASP Top 10 and bots
- Expert led VAPT plus an AI scanner
- Compliance across 200 plus frameworks
- AI security questionnaires from live platform state
- SAST, SCA, SBOM and licence checks
- ZTNA included as a module, not a separate platform
- One console, one owner, one bill
Osto vs Zscaler: what companies actually care about
Seven criteria decide most Osto vs Zscaler evaluations. Each verdict below is followed by the reason behind it.
| Criteria | Osto | Zscaler |
|---|---|---|
| Who is it for? | Startups and lean teams. No security function required. | Distributed enterprise workforces. Assumes an administrator to own policy. |
| Which direction is protected? | Inbound and outbound. WAAP in front of your app, ZTNA for your team. | Outbound. User to internet, SaaS and private app traffic. |
| Is the product we ship protected? | Yes, at the edge. WAAP filters OWASP Top 10, bots and DDoS. | Not covered. Access brokering does not sit in front of your app. |
| How is it priced? | One platform. Every module included, not metered per seat. | Per user. Editions and add-on modules determine what you get. |
| Is penetration testing included? | Yes. Expert led VAPT plus a scheduled AI scanner. | Not included. Testing is a separate firm and a separate cycle. |
| What does compliance look like? | Built in. 200 plus frameworks, evidence from Osto’s controls. | Not included. No control mapping, evidence or questionnaires. |
| How many vendors will I need? | Fewer. Controls, compliance and testing in one layer. | More. App protection, testing and audit stay outside. |
The practical difference: In an Osto vs Zscaler decision it comes to this. Zscaler secures the way your team works. Osto secures what your company sells, and the compliance behind it, with zero trust access included as one module.
Osto vs Zscaler: which platform fits your team?
Your priority is workforce access at scale
Zscaler for startups makes sense on its own when you have a large distributed workforce, a VPN to replace, an administrator to own policy, and your application security, testing and compliance are handled elsewhere.
You want security and compliance solved together
You need protection for the product you ship, compliance automation, VAPT and security questionnaires, with zero trust access for your own team included rather than bought separately.
Why growing teams pick Osto in an Osto vs Zscaler decision
The product you ship is covered
A self configuring WAF applies positive security policy without hand written rules.
ZTNA is a module, not the whole platform
Zero trust access for your team sits alongside cloud, endpoint and code security.
The audit layer is part of the product
Evidence is pulled from controls Osto runs and mapped to 200 plus frameworks.
Not priced per seat
Coverage does not get more expensive every time you hire.
Secure what you sell, not just how your team connects.
If your Osto vs Zscaler shortlist came down to coverage, see how Osto brings cybersecurity, compliance automation, VAPT and security operations together for fast-moving teams.
Book a DemoOsto vs Zscaler: common questions
Osto vs Zscaler: what is the main difference?
Zscaler is a zero trust access platform that routes and inspects traffic from your users to the internet, SaaS and private applications, licensed per user across tiered editions. Osto protects the application your customers reach, along with cloud posture, endpoints and code, and includes compliance automation, VAPT and security questionnaires.
Is Osto a Zscaler alternative?
It depends what you are replacing. Osto includes ZTNA for your own team, so for that use it is a Zscaler alternative. Most teams comparing Osto vs Zscaler are not only buying access control though, they also need the product they ship protected and the audit answered, which sits outside an access platform.
Does Zscaler protect our web application and APIs?
No. Brokering how your employees reach applications is a different job from standing in front of the application your customers log into. That needs a web application firewall, bought separately. Osto includes reverse proxy web and API protection with automatic app and API discovery.
Will Zscaler get us SOC 2 ready?
No. Zscaler compliance features report on the access policies you have configured. They do not map your controls to a framework, collect audit evidence or answer questionnaires, so teams add a separate compliance platform. Osto includes compliance automation across 200 plus frameworks. The audit opinion still comes from an accredited independent auditor.
Is per user pricing a problem for a startup?
It becomes one as you hire. Zscaler pricing is per user, so security cost tracks headcount rather than risk, and capability still depends on which edition you bought. Osto includes every module in one platform, so adding people does not change what you are protected against.
How long does SOC 2 take with Osto?
Roughly 115 days end to end: seven days to readiness including VAPT, a mandatory three month evidence window, then around ten days of external CPA audit by an AICPA accredited firm. The evidence window is set by the standard, so no platform can remove it.