Bill doesn't grow with accounts
A client on 1 platform and a client on 11 cost the same profile group. When your users grow their social presence, your infrastructure cost stays flat.
The Zernio Alternative With Predictable Pricing
Both are developer APIs for social media publishing and engagement — covering DMs and comments. Zernio also adds ads management. Postproxy goes deeper on the publishing side: predictable per-group billing, scoped API keys, and a 99.97% uptime SLA.
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OVERVIEW
TL;DR
A quick take in two columns, then the detailed comparison below.
Zernio
15+ platforms — including WhatsApp, Telegram, Discord, Snapchat, and Reddit — plus ads management across 6 networks, a DM and comment inbox, and now phone numbers with SMS sending. Pricing is per connected social account: graduated tiers starting at $6/account/mo. Every account a user connects is a billable line item. Free tier: 2 accounts with unlimited posts.
Postproxy
Publishing and engagement API. Covers the full cycle: scheduling, publishing, reading and replying to DMs and comments. Two pricing models: per connected profile (Agentic, from $17/mo) for agents and automations, or per profile group (Business, $49/mo) for SaaS and agencies. On Business — unlike Zernio's per-account billing — each group spans up to 11 platforms, so a single group can hold 11 connected accounts, and 50 groups run $109/mo. Your bill doesn't change when a client adds more platforms. Scoped API keys give true per-client data isolation. 99.97% uptime SLA vs Zernio's 99.7%+. Free tier: 10 posts/month, no credit card required.
COMPARISON
Side by side
A full breakdown of capabilities, integrations, and API design.
| Zernio | Postproxy | |
|---|---|---|
| Platforms | 15+ (incl. Discord, Snapchat, Reddit) | 11 publishing networks, plus WhatsApp Business messaging |
| Pricing model | Per connected social account (graduated) | Per profile (Agentic) or per profile group (Business) |
| Cost scales with account growth | Yes — every new account adds to bill | Flat on Business — adding accounts to a group is free |
| Free tier | 2 accounts, unlimited posts | 10 posts/mo, 2 profile groups, permanent |
| Uptime SLA | 99.7%+ | 99.97% |
| Multi-tenant isolation | Shared API key + profile_id parameter | Scoped API keys (per-client) |
| Ads API | Yes (6 networks: Meta, Google, TikTok, LinkedIn, Pinterest, X) | No |
| Phone numbers & SMS | Yes | No — social media only, by design |
| DM / comment inbox | Yes (read and reply) | Yes (read and reply) |
| SDKs | 8 (Node, Python, Go, Ruby, Java, PHP, .NET, Rust) | 7 (Node/TS, Python, Go, Ruby, PHP, Java, .NET) |
| Queue system | Recurring slots (minimal docs) | Slots, jitter, priority |
| Publish lifecycle | Partial status + manual retry | State machine (draft → pending → published → failed → retry) |
| n8n | Yes (official node) | Yes (official node) |
| Make.com | Yes (20+ modules) | Yes |
| Zapier | Yes | Yes |
| MCP server | Yes | Yes |
| BYOK | Not available | Yes (all platforms) |
TIERS & LIMITS
Pricing at scale
Postproxy pricing flexes to your use case: pay per profile (Agentic) when you run agents and automations, or per profile group (Business) for predictable billing that doesn't move as clients add platforms. The scenarios below use the per-group Business plan — where the same plan covers whether your clients use 1 platform or all 11 — against Zernio's per-account model.
| Scenario | Zernio | Postproxy | Savings |
|---|---|---|---|
| 10 profile groups, ~30 accounts | ~$108/mo | $49/mo (Business) | 55% |
| 50 profile groups, ~150 accounts | ~$368/mo | $109/mo (Business) | 70% |
| 50 profile groups, 550 accounts (max) | ~$768/mo | $109/mo (Business) | 86% |
| Enterprise (300 groups) | Grows per account | $399/mo | Fixed |
The middle two rows use the same Postproxy plan ($109/mo — Business plus 30 extra groups). One has 150 accounts, the other 550. Your bill doesn't move. On Zernio, the same growth adds about $400/mo (~$368/mo at 150 connected accounts vs ~$768/mo at 550).
KEY DIFFERENTIATORS
Where Postproxy wins
APIs, SDKs, tenant isolation, and predictable behavior, without running publishing infrastructure yourself.
Safe during trial spikes
Per-account billing means a viral signup day — users connecting accounts and churning — can generate hundreds of dollars in unexpected charges. Profile-group pricing caps your exposure at the plan you chose.
Scoped API keys
Each client gets a key that can only see their own data. Zernio routes everything through a shared key with profile_id as a parameter — a leaked key exposes all your clients.
Higher uptime SLA
99.97% uptime commitment vs Zernio's 99.7%+. At publishing scale, the difference between 99.7% and 99.97% is meaningful for the reliability guarantees you can offer your customers.
Explicit failure handling
Full state machine: draft → pending → published → failed → failed_waiting_for_retry. Automated pipelines know exactly what happened and when. Zernio offers manual retry via CLI only.
Queue system
Time slots with jitter and priority levels for high-volume publishing. Zernio has recurring slots but minimal documentation on queue behavior.
WHAT THEY DO DIFFERENTLY
Where Zernio is different
15+ platforms
Includes Discord, Snapchat, and Reddit — platforms Postproxy doesn't cover yet. WhatsApp is no longer among them: Postproxy ships WhatsApp Business messaging, with templates and the 24-hour window handled. If you need Discord, Snapchat, or Reddit today, Zernio reaches them now.
Ads API
Zernio offers unified ad campaign management across Meta, Google, TikTok, LinkedIn, Pinterest, and X. If paid social campaign management is part of your product, Zernio covers it through a single API.
Phone numbers & SMS
Zernio now sells phone numbers and SMS sending. Postproxy deliberately doesn't — we keep the product social-media-only so the engineering effort goes into publishing reliability, not into maintaining a telecom stack alongside it. One focus keeps performance high and maintenance costs low, and that shows up in our pricing and uptime.
VERDICT
Which one to use
Different tools solve different problems. Here's how to pick the right one.
Choose Zernio if:
- Your product needs Discord, Snapchat, or Reddit
- You're building paid social campaign management (ads API)
- You want phone numbers and SMS bundled with your social API
Choose Postproxy if:
- You're building a publishing SaaS with multiple clients
- You need predictable billing that doesn't scale with users' account count
- You need per-client data isolation at the API key level
- Your SLA requirements demand 99.97% uptime
- You need automated retry and explicit failure states in your pipeline
Try Postproxy free
10 posts/month, all platforms, no credit card. Upgrade when you need more.
