Upload-Post vs Zernio: Which Is Better in 2026?
Affiliate disclosure: the link to Zernio is an affiliate link — we may earn a commission if you buy, at no cost to you. The link to Upload-Post is a plain link: we earn nothing from it. Neither changes this comparison, which is based on editorial research.
Both are social media APIs with an MCP server, a free tier that needs no card and a Spanish operating company: Upload-Post is run by TONVI TECH SL in Málaga, Zernio by ZERNIO SOFTWARE SL in Palamós, Girona. They part ways on the unit they bill. Upload-Post sells flat plans sized by profiles, where a profile is one person or client with an account on each network. Zernio charges per connected account on a graduated monthly ladder. For five brands posting to Instagram and LinkedIn, that comes to $24 a month at Upload-Post and $48 at Zernio, on monthly billing.
| Upload-Post | Zernio | |
|---|---|---|
| Our rating | 4.3/5 | 4.3/5 |
| Price from | Free plan (10 uploads/month, 2 profiles, no TikTok); paid from $16/mo flat per plan for 5 profiles, billed annually ($24 billed monthly) | Free for the first 2 connected accounts, no credit card; then usage-based at $6 per connected account per month for accounts 3 to 10, $3 for 11 to 100 and $1 from 101 (no cap); X API calls, sent messages beyond 10,000 a month and managed ads beyond 500 are metered on top |
| Free plan | ✓ | ✓ |
| Free trial | Unclear | ✗ |
| Pricing model | One flat price per plan, sized by the number of profiles (the docs FAQ calls Business usage-based billing; see the Business plan). A profile is one person or client, not one social account, and connects one account on each network. The vendor says it never charges per user, per channel or per post, but each plan caps seats: 1 on Free and Basic, 2 on Professional, 5 on Advanced and 10 on Business. Plans are billed monthly or annually; annual prices are shown as a monthly equivalent and charged as a yearly total ($192, $400, $1,411 or $4,205). The Free plan is a lasting $0 plan, not a trial. On refunds the vendor’s pages conflict: the pricing page and homepage advertise a 15-day money-back guarantee on paid plans, but the Terms of Use (§7.3) call payments generally non-refundable and say refund requests are considered case by case at the vendor’s discretion. Extra-profile packs (one size per plan; packs do not stack) and an add-on for links on X are sold on top. The X links add-on costs $19 a month on monthly billing; for annual billing the pricing page labels it “+$19/mo (billed monthly)”, while the docs say annual plans pay $152 a year. Prices are in USD, and the vendor says European customers see EUR in the app. | Usage-based, paid by card (the rate card says Card, monthly), with no seats, no plan tiers and no annual billing. The self-serve option, Build, charges per connected account per month on a graduated ladder: accounts 1 to 2 free, 3 to 10 at $6, 11 to 100 at $3 and 101 and up at $1, with no cap; each band prices only the accounts inside it, and billing is prorated by account-day. Outbound inbox messages beyond 10,000 a month, managed ads beyond 500, X API calls (at X’s rates), phone numbers, calls, SMS, RCS, iMessage and payout transfers are metered on top. Enterprise is custom-priced and available past 2,000 accounts, with postpaid invoicing on net-30/60 terms, and the Enterprise page says most enterprise contracts include volume-based discounts on the public ladder. Each ad account and each WhatsApp number counts as a connected account on the same ladder (the pricing docs: “A Page, its Instagram account and the Meta ad account behind them are 3”). Zernio’s own pages conflict on two points. The pricing FAQ says usage is “billed at the end of each billing period”, while the billing docs say “Zernio charges your card as you accrue usage, not once at the end of the month”, first at a threshold that starts at $10 and then doubles. The pricing page says “Every feature included, nothing gated behind a plan”, while API reference entries for ads still say “Requires the Ads add-on”. |
| Best for | Developers and SaaS products that want to publish to many networks from one API call | SaaS products that let their users post, reply or report on social networks from inside the product |
| Platforms | Web app; REST API with Python and Node.js SDKs, a CLI, a GitHub Action and a hosted MCP server | Cloud REST API and web dashboard; official SDKs for Node.js, Python, Go, Ruby, Java, PHP, .NET and Rust; CLI; hosted MCP server |
Our rating: the median of five independent editorial scores per tool, each taken from a uniform fact sheet of our review, on the same criteria and rules for the eight Social Media & Messaging APIs. It weighs value and pricing transparency, free ways to try the API (a trial or free plan earns that credit only if it includes the API), what works today (usable networks only), developer and agent tooling, trust (independent ratings, security evidence, company age and size where the review states them, and incidents on the vendor’s own status page, weighed by hours and severity) and consistency of the vendor’s own pages, where each self-contradiction counts once, at the same weight for every vendor. Affiliate status is not an input. How we score
Social media posting API with SDKs and an MCP server, a free plan and flat per-plan prices sized by profiles rather than accounts
WHY PICK IT- A lasting Free plan with API access, 2 profiles and no credit card, not a time-limited trial
- Flat price per plan sized by profiles, and each profile holds one account on every network: Basic is $24 a month billed monthly ($16 billed annually) for 5 profiles
- The vendor lists 22 networks, from TikTok, Instagram and YouTube to Bluesky, Mastodon, Discord, Telegram, WordPress and Dev.to
Social media API and MCP server for posting, DMs, analytics and ads from code, priced per connected account with the first 2 free
WHY PICK IT- Free tier for 2 connected accounts with the full API, analytics and no credit card, and no seats or plan tiers to choose between
- Published graduated price per connected account per month ($6, then $3, then $1, no cap), with the proration formula and worked examples in the docs
- One request shape publishes to 10 social networks plus WhatsApp, Telegram, Discord and Slack (Reddit and Snapchat are listed too, but their docs pages say Reddit is temporarily unavailable and Snapchat is not available yet), and the same API covers DMs, comments, reviews, analytics, 9 ad networks and blog articles
The verdict
Choose Upload-Post if each brand or client posts to several networks and the bill should follow clients, not accounts. Basic is $24/month on monthly billing ($16/month billed yearly) for 5 profiles, Professional $50/month ($33 billed yearly) for 25 profiles with white-label, and the Free plan gives 2 profiles and 10 uploads a month with API access. It lists 22 networks, Mastodon, Dev.to and WordPress among them, although its docs say Reddit posting currently returns HTTP 503.
Choose Zernio if your agent needs more than posting and comment replies: DMs beyond Instagram, campaigns on 9 ad networks, or WhatsApp and SMS messages from the same integration. Ten posting accounts cost $48 a month on usage-based monthly billing, the first 2 free with no card; each ad account and WhatsApp number adds a connected account, and numbers, SMS, sent messages above 10,000 a month and managed ads above 500 are billed on top. Zernio ships official SDKs in 8 languages against Upload-Post's Python and Node.js. Expect no annual price, and X posts billed per API call at X's rates.
Bottom line: For posting alone across several clients, Upload-Post is the cheaper bill, half of Zernio's for five brands on Instagram and LinkedIn. Choose Zernio when the same integration also has to cover DMs beyond Instagram, ads beyond ChatGPT Ads, or messaging channels, and budget for the connected accounts and meters they add.
Read the full reviews: Upload-Post · Zernio.