AI caption maker for every social platform
Our AI caption maker writes a separate version for each platform you post on, sized for that feed's actual truncation.
Marketing Plan
Trusted by leading teams worldwide
Why one caption can't survive every feed.
Each social platform crops captions at a different character count and rewards a different verbal shape. Instagram crops at 125 characters and rewards narrative warmth. Facebook crops at 63 and rewards a hook that reads like a friend's text. LinkedIn crops at 210 on mobile and rewards declarative claims. TikTok crops at 100 and rewards conversational deadpan. X holds 280 total but rewards density, with every word earning its place. Our AI was trained on the top-engaging captions across these platforms separately and writes each version against the platform's actual mechanics, not a master draft adapted everywhere.
Writing the caption pack in four moves
Soshie can summarize all the information you provide to it.
From scheduling your week to writing content and responding to messages, Sintra’s AI Agents
Key Generation Features of Soshie
eCommerce Manager
Drives online sales growth through strategy, data, and innovation.
Business
Strategist
Shapes company direction through analysis, planning, and vision.
Customer
Support
Ensures client satisfaction by resolving issues quickly.
Data
Analyst
Transforms raw information into insights guiding business decisions.
Trained on top-engaging captions per platform, not one master draft.
Each platform's caption is its own writing problem. Our AI was trained on the corpus of high-engagement captions per platform: Instagram separately, TikTok separately, LinkedIn separately. So the Instagram version isn't an adapted LinkedIn line; it was written for Instagram from the first word.
Common use cases for the AI caption maker
Brand teams shipping a campaign across 5 platforms in a day
Brand marketers launching a coordinated campaign across Instagram, TikTok, Facebook, LinkedIn, and X simultaneously. Our AI ships the full caption pack at the moment of launch so the marketer isn't writing into the night.
Solo creators with limited writing bandwidth
Creators running their own content across 3 or more platforms without a copywriter. Our AI handles the per-platform caption work so the creator can put the time into filming.
Social agencies servicing multi-platform clients
Account managers writing daily captions for 5 to 10 clients across 4 platforms. Our AI compresses the per-client caption time from hours to minutes per day.
Power-Ups
available for Soshie
Helpers of the month, every month.
With over 40,000 entrepreneurs from more than 100 countries, Sintra is the world’s leading provider of business automation tools and AI-powered solutions, including AI for marketing, AI for customer support, and more. Sintra supports businesses at every stage of their AI implementation journey, from initial pilot phases to scaling and optimizing AI initiatives.
I can’t recommend SintraAI enough. It’s like having a personal business coach 24/7, mapping out steps to grow my company and clarifying my priorities. I feel a renewed sense of focus and control every day.
December 29, 2024 • Socrate Concepcion • US
Each AI bot tackles my to-do list, from scheduling tasks to crawling my website for SEO tips. I love how it set up calendar reminders for all my commitments. Sintra.ai is well worth every penny, especially for a busy single-person business.
December 14, 2024 • Jennifer Glenn • US
As an entrepreneur launching a new venture, Sintra.ai has made a real difference. The AI assistants are like personal staff I can rely on. And whenever I needed support, the team was on point. A must-try for any budding business!
December 21, 2024 • Custódio Barreiros • HU
I once had a large team, and although I loved my helpers, they needed constant motivation. With Sintra, there’s no drama, just new ideas that I can simply accept or reject. It’s a huge relief—100% recommended.
December 26, 2024 • Holly Wehde • US
Hiring Sintra was a great decision for my struggling boutique. They handle social media posts, guide my ads, and even offered a solution for double social media pages. Now I can focus on my inventory and customers.
December 17, 2024 • Michele Davis • US
Signed up for Sintra X—it felt overwhelming at first, but once it understood how I think, it turned into a creative powerhouse. Support is top-notch, and the daily integrations impress me.
Dec 10, 2024 • Sami Liftoff • US
I’m not usually one to give top marks, but once I got comfortable with Sintra’s 12 helpers, I was blown away by their efficiency. They churn out so many analytical ideas I have to pause and digest them. It’s sometimes overwhelming, but in a good way.
December 29, 2024 • lars • DK
Sintra integrates with all my favorite tools and these little helpers automate my tasks in a huge way. They actually learn my company’s style day by day. It’s a massive step up from generic AI chats.
December 30, 2024 • Michelangelo • IT
My life is simpler with Sintra. It handles content creation, next steps, brainstorming, and copy. I highly recommend it if you want to free up mental space for what truly matters in your business.
December 28, 2024 • Lionel D'Alvia • US
My “team” in Sintra knocks out tasks like magic, offering fresh ideas for efficiency and better customer outreach. It’s a relief knowing I have AI assistants ready to go around the clock.
December 31, 2024 • Kat Angelica • US
I’ve only been using Sintra for a couple of weeks, but the experience has been great—especially with the social media bot reaching out to me with new ideas. The pull model feels super proactive and makes me more confident in my daily tasks.
December 30, 2024 • Bayan Qandil • US
I challenge anyone to compare other platforms to Sintra.ai and their staff—you won’t find a better customer experience. Everyone is professional, responsive, and genuinely cares about helping. Truly top-notch!
December 28, 2024 • Timothy Montjoy • US
This platform helps me like a full-time employee would. As a startup, I can’t afford extra staff, so Sintra stepped in to handle complex tasks and free me up for big-picture thinking.
December 28, 2024 • Jules Kincaid • US
I’m juggling multiple hats in my business, and these 12 AI “helpers” lighten the load. They even crack jokes and celebrate milestones with me! I saved thousands in consultant fees by letting Sintra handle SEO and content tasks.
December 30, 2024 • Michelle Smith • US
This platform helps me like a full-time employee would. As a startup, I can’t afford extra staff, so Sintra stepped in to handle complex tasks and free me up for big-picture thinking.
December 24, 2024 • Domanic R.H • US
So that's Soshie.
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Cross-platform caption questions from active social leads
What posters ask once they're running the same content across multiple feeds.
Should I always post the same content across every platform?
Usually no. If a post is built for one platform's format (a Reel for Instagram, a thread for X), pushing it everywhere weakens it. The captions are different because the underlying posts often should be too. Our AI flags when an idea is platform-specific.
Can our AI handle captions in other languages?
Yes. Tell our AI which language and the regional context. The captions come back with idioms native to that market, not a literal translation that reads off.
How do I handle emojis across platforms?
LinkedIn under-uses them. X almost never. Instagram, TikTok, and Facebook lean on them more. Our AI calibrates per platform instead of stamping the same emoji set across all five.
Do hashtags go in the caption or as a first comment?
Instagram: first comment, keeps the caption clean while still getting indexed. TikTok: in the caption, the algorithm reads them there. LinkedIn: 2-3 max, in the caption. Facebook: usually skipped. X: skipped, since they no longer help reach.
Can our AI mirror my brand voice across the set?
Yes. Paste 5-10 captions you're proud of and our AI weights the new captions toward that voice while staying inside each platform's structural conventions.
Will the captions work for paid ads too?
Yes, but tell our AI it's an ad. The hook gets sharper, the CTA gets more direct, and the structure stays inside each platform's sponsored-placement character limits, which are tighter than organic in some cases.
